dock: Don't update to v3

Author: soreau

src/dock/toplevel.cpp

@@ -155,10 +155,6 @@ static void handle_toplevel_closed(void *data, toplevel_t handle)
     zwlr_foreign_toplevel_handle_v1_destroy(handle);
 }
 
-static void handle_toplevel_parent(void *data, toplevel_t handle, toplevel_t parent)
-{
-}
-
 namespace
 {
 struct zwlr_foreign_toplevel_handle_v1_listener toplevel_handle_v1_impl = {
@@ -168,7 +164,6 @@ struct zwlr_foreign_toplevel_handle_v1_listener toplevel_handle_v1_impl = {
     .output_leave = handle_toplevel_output_leave,
     .state        = handle_toplevel_state,
     .done         = handle_toplevel_done,
-    .closed       = handle_toplevel_closed,
-    .parent       = handle_toplevel_parent
+    .closed       = handle_toplevel_closed
 };
 }